RIIAPHIUM XIPIIANDRIUM. 141 



i 



The name of the genus (from '^lov, small needle) has reference 

 to the shape of the antenna?, which distinguishes it. 



Only a single European and one North American species, de- 

 scribed below, are known at present. 



1. R. lllgllbre LOEW. 9 . Ex viridi nigrurn, nitens, pedibus nigris, 

 anterioruin tibiis intermediorumque femoribus hiteis. 







Greenish-black, shining ; feet black ; the four anterior tibi?e and the middle 

 femora dusky yellow. Long. corp. 0.16. Long. al. 0.16. 



SYN. Rhaphium lugubre LOEW, Neue Beitr. VIII, 49, 1. 



Of a bright metallic, but very dark greenish-black color. Face 

 moderately broad, with a bright lustre of silvery-white powder 

 upon black ground. Palpi black with white powder. The black 

 antennae very long, narrow and glabrous ; the apical bristle short 

 and bare. Front shining black. Cilia of the upper orbit black, 

 delicate, short ; cilia of the lateral and inferior orbits white. 

 Thorax bright, with an almost imperceptible gray-whitish dust. 

 The scutellum has no hair with the exception of the usual bristles. 

 Abdomen bright, only on the lateral margin with distinct white 

 powder ; the hair upon it is black. Coxae black with white dust ; 

 the front side of the fore coxae with white hair and black bristles. 

 Anterior femora black with luteous tip ; fore tibia? luteous, only 

 with two bristles on the upper side ; fore tarsi black, the first joint 

 as far as the tip, luteojis. Middle feet luteous, tarsi from the tip 

 of the first joint blackened. Hind feet entirely black, only the 

 knees yellow ; the first joint of the tarsi scarcely a little longer 

 than the second. Cilia of the brown tegulaa whitish. Wings 

 blackish, on the fore margin and along the veins darker ; the last 

 segment of the fourth longitudinal vein only in the middle gently 

 inflected forward. 



Hob. Carolina. 



Gen. XIX. XIPHANDRIUM. 



The genus Xiphandrium comprises small species, of slender 

 form, with little hair. The first joint of the antennae has no hair 

 on the upper side ; the second is of a transverse form, the third 

 rather narrow, in the male very much elongated and in the female 

 much shorter ; the hairs upon it are distinct, especially on the 

 under side. Arista entirely apical, comparatively short, with 



